**Acknowledgement**

The authors particularly thank the precious collaborators in the cetacean sampling: for freeranging cetaceans Jorge Urban Ramirez, Lorenzo Rojas-Bracho, Claudia Diaz, Carlos A. Nino Torres, Lorena Viloria, Carlos Alberto (Mexico); for stranded cetaceans Fabrizio Cancelli, Tommaso Renieri, Fabrizio Serena, Cecilia Mancusi, Sandro Mazzariol (Italy).

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